TORONTO - One of Canada's big banks is cutting its economic forecast for the country for a second time in a matter of weeks.

CIBC World Markets is now estimating the country's gross domestic product will grow by only 1.3 per cent this year, after adjusting for inflation.

That's down from its previous forecast last month of 1.7 per cent growth in GDP.

CIBC chief economist Avery Shenfeld says a major concern is global investor sentiment, which has resulted in lower stock prices, changes on the bond market and a buildup of cash in Canadian households.

But Shenfeld warns against an "overdose on pessimism."

A report by other economists in the same CIBC report said they expect a modest increase on commodity prices next year, following a "bit better" economic growth in 2016 and 2017 and reduced supplies of some commodities.